A bullaun is a large stone, usually boulder-sized, into which one or more rounded depressions have been ground, either by human hand or, more rarely, by natural weathering. They are found throughout Ireland, often near early ecclesiastical sites or holy wells, and the water that collects in their basins has long been associated with healing and cursing traditions. The name Cnoc An Iúir translates roughly from Irish as the hill of the yew tree, a name that carries its own quiet suggestion of age and significance, since yews were considered sacred in pre-Christian Ireland and were frequently planted at places of ritual or burial.

Bullaun stones are notoriously difficult to date with precision. Some may be early medieval in origin, associated with monastic activity and the grinding of pigments or grains, while others appear to have served a purely votive function, accumulating small stones or water as part of local practice that continued long after any institutional religious context had faded. The specific history of this particular example at Cnoc An Iúir remains poorly documented, which is itself not unusual. Many bullauns in rural Cork and across Munster more broadly survive as isolated features in fields or at townland boundaries, their original context eroded by time and agricultural change, recognised locally but largely unrecorded in any detailed way.